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Coal Inspectorate | Alert | No.418 V 1 | 06 October 2022

Roof bolt nuts

What happened?

Routine testing of a 24mm roof bolt nut at an underground coal mine found a crack running through the face of the nut. Additional testing identified that the same issue had affected a small number of other roof bolt nuts, prompting the mine to replace current stocks of the items.

Roof bolt nuts are used to support roof materials in underground coal mines. Faults in roof bolt nuts could potentially compromise the integrity of roof support commonly used in underground mine roadways.

How did it happen?

Key issues


Site Senior Executives should:

Investigations are ongoing and further information may be published as it becomes available. The information in this publication is what is known at the time of writing.

We issue Safety Notices to draw attention to the occurrence of a serious incident, raise awareness of risks, and prompt assessment of your existing controls.

Authorised by Shaun Dobson - Chief Inspector – Coal

Contact: Laurie Crisp, Inspector of Mines , 0459 878 914

Issued by Resources Safety & Health Queensland

Safety: This information is issued to promote safety through experience. It is not to be taken as a statement of law and must not be construed to waive or modify any legal obligation.
Placement: Place this announcement on noticeboards and ensure all relevant people in your organisation receive a copy, understand the content, findings and recommendations as applicable to their operation. SSEs should validate that recommendations have been implemented.

All information on this page (Roof bolt nuts - is correct as of time of printing (9 Dec 2022 4:51 am).